The expulsion of ash, cinders, bombs, and gases during an explosive eruption.

active

A volcano that is currently erupting or showing signs that it will erupt.

magmachamber

A material found in magma and made of silicon and oxygen.

pahoehoe

A volcano that no longer active and unlikely to erupt again.

viscosity

Two or more elements that are chemically combined.

physical

Fast-moving lava that hardens to form smooth, rope-like coils.

chemical

Long tube through which magma moves through a volcano.

pipe

A volcano that is not currently active, but will be active again.

dormant

Weak spot in the crust where magma has come to the surface.

islandarc

Liquid magma that reaches the surface.

pyroclasticflow

Pocket beneath a volcano where magma collects.

ringoffire

Fountain of water and steam that builds up underground and erupts at regular intervals.

magma

___ property - any characteristic of a substance that can be observed or measured without changing the composition of the substance.

lavaflow

____ property - any property of a substance that produces a change in the composition of the matter.

cindercone

Slow-moving lava that hardens to form rough chunks.

volcanicneck

A large hole formed when a volcano collapses.

sill

Area where magma melts through the Earth's crust.

batholith

Mass of rock formed when a large body of magma cools outside of the crust.

extinct

Wide, sloping mountain made of layers of lava and formed by quiet eruptions.

shieldvolcano

Molten mixture of rock-forming substances, gases, and water from the mantle.

lava

A substance that cannot be broken down into other substances.

veht

The resistance of a liquid to flowing.

crater

String of islands formed by volcanoes.

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